I'm not sure whether the responses will be sent to the clone pool, but per the solution below I think they will be:
SOL8573: Overview of port mirroring and clone pools
https://support.f5.com/kb/en-us/solutions/public/8000/500/sol8573.html
A clone pool is a property of a virtual server, and it receives all of the same traffic as the load-balancing pool.
Also, I expect the functionality will be the same whether you call the clone pool using the VIP configuration or from an iRule. The configuration is fairly straightforward and is described in SOL8573.
If you test this and find out the answer, could you reply here for reference?
Thanks,
Aaron